Not really a spoiler but I'm sure someone would get their panties in a bunch.


About 60 seconds before the credits end, it starts playing the Edith Piaf song "Non je ne regrette rien" which translates to "No, I Regret Nothing". It's the song they used as the musical cue to coordinate the kicks on each level. It's a nice touch at the very end of the credits like Nolan's cuing a final kick for the audience. At the very end of the credits, the song slowly bleeds into the main Inception theme.


Like I said, not essential to hear/see, but it's a nice touch that really shows the thought Nolan put into this film.